本研究主要目的有二：首先，以四氯化鈦為原料製備出粒子粒徑介於20∼50nm、具有結晶性之氧化鈦穩定懸浮溶液。其次，將上述氧化鈦粒子添加有機界面劑，避免粒子聚集。
我們以共沈澱法於酸性的環境下（pH=1.5）合成氫氧化鈦溶膠。經去離子水洗除溶膠中大部分的離子後，再以適當的酸量解膠。所產生氫氧化鈦可以較少量的酸達到解膠的目的。我們還比較了不同老化時間、解膠溫度、解膠時溶液酸鹼值對最後氫氧化鈦粒子大小之影響。於酸性環境下滴定合成的氫氧化鈦，只需添加酸鈦比為0.2左右的酸量，使溶液酸鹼值約介於1.2∼1.5之間即可。於60℃加熱4小時內解膠即可製備出平均粒徑25nm的銳鈦礦（anatase）相氧化鈦結晶粒子。此時溶液本身成分為TiO2/HCl/H2O=1/0.196/44.27，氧化鈦固含量佔9.05wt﹪。
另外，於合成出之氧化鈦結晶懸浮液中添加有機酸等界面劑，能有效將表面改質而產生穩定之作用。氧化鈦粒子之界面電位隨著界面劑所帶有之羧基（-COOH）增加而增大。有機酸若只含一個羥基對氧化鈦粒子界面電位的影響並不大，但已足以造成立體屏障效應維持粒子的穩定懸浮。而雙酸或三酸對界面電位影響較大，但氧化鈦粒子卻有聚集現象發生。

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